/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.handmark.pulltorefresh.library.internal;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Matrix;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.R;

@SuppressLint("ViewConstructor")
public class IndicatorLayout extends FrameLayout implements AnimationListener {

    static final int DEFAULT_ROTATION_ANIMATION_DURATION = 150;

    private Animation mInAnim, mOutAnim;
    private ImageView mArrowImageView;

    private final Animation mRotateAnimation, mResetRotateAnimation;

    public IndicatorLayout(Context context, PullToRefreshBase.Mode mode) {
	super(context);
	mArrowImageView = new ImageView(context);

	Drawable arrowD = getResources()
		.getDrawable(R.drawable.pulltorefresh_head_indicate);
	mArrowImageView.setImageDrawable(arrowD);

	final int padding = getResources().getDimensionPixelSize(
		R.dimen.indicator_internal_padding);
	mArrowImageView.setPadding(padding, padding, padding, padding);
	addView(mArrowImageView);

	int inAnimResId, outAnimResId;
	switch (mode) {
	case PULL_FROM_END:
	    inAnimResId = R.anim.slide_in_from_bottom;
	    outAnimResId = R.anim.slide_out_to_bottom;
	    setBackgroundResource(R.drawable.indicator_bg_bottom);

	    // Rotate Arrow so it's pointing the correct way
	    mArrowImageView.setScaleType(ScaleType.MATRIX);
	    Matrix matrix = new Matrix();
	    matrix.setRotate(180f, arrowD.getIntrinsicWidth() / 2f,
		    arrowD.getIntrinsicHeight() / 2f);
	    mArrowImageView.setImageMatrix(matrix);
	    break;
	default:
	case PULL_FROM_START:
	    inAnimResId = R.anim.slide_in_from_top;
	    outAnimResId = R.anim.slide_out_to_top;
	    setBackgroundResource(R.drawable.indicator_bg_top);
	    break;
	}

	mInAnim = AnimationUtils.loadAnimation(context, inAnimResId);
	mInAnim.setAnimationListener(this);

	mOutAnim = AnimationUtils.loadAnimation(context, outAnimResId);
	mOutAnim.setAnimationListener(this);

	final Interpolator interpolator = new LinearInterpolator();
	mRotateAnimation = new RotateAnimation(0, -180,
		Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
		0.5f);
	mRotateAnimation.setInterpolator(interpolator);
	mRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
	mRotateAnimation.setFillAfter(true);

	mResetRotateAnimation = new RotateAnimation(-180, 0,
		Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
		0.5f);
	mResetRotateAnimation.setInterpolator(interpolator);
	mResetRotateAnimation.setDuration(DEFAULT_ROTATION_ANIMATION_DURATION);
	mResetRotateAnimation.setFillAfter(true);

    }

    public final boolean isVisible() {
	Animation currentAnim = getAnimation();
	if (null != currentAnim) {
	    return mInAnim == currentAnim;
	}

	return getVisibility() == View.VISIBLE;
    }

    public void hide() {
	startAnimation(mOutAnim);
    }

    public void show() {
	mArrowImageView.clearAnimation();
	startAnimation(mInAnim);
    }

    @Override
    public void onAnimationEnd(Animation animation) {
	if (animation == mOutAnim) {
	    mArrowImageView.clearAnimation();
	    setVisibility(View.GONE);
	} else if (animation == mInAnim) {
	    setVisibility(View.VISIBLE);
	}

	clearAnimation();
    }

    @Override
    public void onAnimationRepeat(Animation animation) {
	// NO-OP
    }

    @Override
    public void onAnimationStart(Animation animation) {
	setVisibility(View.VISIBLE);
    }

    public void releaseToRefresh() {
	mArrowImageView.startAnimation(mRotateAnimation);
    }

    public void pullToRefresh() {
	mArrowImageView.startAnimation(mResetRotateAnimation);
    }

}
